Three years strikes me as a long lag between the injury and the trinemal neuralgia (had those headaches- horrendous). Bet there's better meds that won't grog you up, and my vote, not knowing any details, is for massage- it helps everything, just like ice cream!
I've got a medication dependent condition, and have found that one womans great med is another womans misery. You can't ride if you're dizzy. Complain to your doc, this is a quality of life issue.

missliz